丙二醇

Firstly, the molybdenum based catalysts modified by silver, phosphorus, vanadium using aluminum oxide as carrier were studied. The results showed that its catalytic performance for 1,2-propane glycol oxidation to methylglyoxal is good.

论文首先对以氧化铝为载体，在银、磷、钒修饰下的钼系催化剂进行了研究，通过实验发现该催化剂对丙二醇氧化制备丙酮醛具有高的催化活性和较好的选择性。

Influences of reaction temperature, catalyst concentration, molar ratio of methanol to propylene oxide and reaction time on conversion of propylene oxide, yield and selectivity of propylene glycol monomethyl ether were studied.

在反应温度为120～130℃、催化剂用量为0.20%～0.30%、甲醇与环氧丙烷摩尔比为3/1～5/1的反应条件下，环氧丙烷的转化率在98％以上，丙二醇甲醚的选择性达95％，收率达93％，产品中伯醚的选择性为92％～93％。

Influences of reaction temperature, catalyst concentration, molar ratio of methanol to propylene oxide and reaction time on conversion of propylene oxide, yield and selectivity of propylene glycol monomethyl ether were studied.

研究了甲醇与环氧丙烷在固体碱催化剂MAF存在下非均相合成丙二醇甲醚的过程。

In addition, oxidoreduction potential of medium was regulated by addition of electron receptors or controlling the ratio of air to nitrogen. By optimizing the fermentation conditions of DA-1HB, 70 g.l-1 1,3-PD was produced and the molar yield of 1,3-PD from glycerol reached 69.9%.

4以1，3-PD合成性能占优的重组菌DA-1HB为工作菌株，调控培养基氧化还原态势，优化发酵工艺，以甘油为唯一碳源时，1，3-丙二醇合成浓度和摩尔得率分别达到70 g.l-1和69.9%。

In the preformulation study, the HPLC method for the analysis of RSP was established firstly and RSP solubility in various vesicles such as water, 20%PEG400, series of ethanol and propylene glycol was determined.

在制剂开发的处方前研究工作中，首先建立了利培酮HPLC分析方法，测定了药物在生理盐水、20%PEG400、各系列浓度的乙醇、丙二醇等溶媒中的溶解度。

Then with V∶V=11 9∶1 0,and by bubbling of air at 65-70 ℃ for 5-8 h,pyruvaldehyde was produced in 59 6% yield.

丙酮醛的总收率达 37 8%。n∶n∶n(1，2 丙二醇)=1 0∶4 0∶(1 5～ 2 5 )，以水为溶剂，在 6 0～ 70℃间歇通入氮气 1 5h ，边加原料边蒸馏，制得产率为5 0 %的丙酮醛。

It was showed that microwave technique could accelerate extracting polysaccharide from Saururus Chinensis Baill and glucose oxidase method provide a new convenien...

实验结果显示运用微波技术从三白草中多糖提取速度加快；以葡萄糖氧化酶法进行多糖含量测定，为多糖含量测定方法寻找一种新的简便的途径；药理实验说明三白草中的多糖可使四氧嘧啶型糖尿病兔体内血糖值降低，超氧化物歧化酶的活力增强，丙二醇下降。

The thermodynamical stuty indicates that the synthesis of propylene carbonate from urea and propylene glycol is possible.

尿素和丙二醇合成碳酸丙烯酯在热力学上是可进行的。

The reaction system of synthesizing propylene carbonate from urea and 1,2-propylene glycol has been analyzed thermodynamically.

对尿素与1，2-丙二醇合成碳酸丙烯酯反应体系进行了热力学分析。

Nickel sulfate was the most frequent sensitizer, followed by Thimerosal, Potassium dichromate, Fragrance mix and Formaldehyde. Frequencies of contact allergy to Thiuram mix, Mercapto mix, Imidazolidinyl urea, and bronopol were relatively low.

结果： 1 129 例受试者中，阳性反应747例，阳性反应率较高的变应原依次是：硫酸镍、硫柳汞、重铬酸钾、芳香混合物、甲醛，阳性反应率较低的变应原有：秋兰姆混合物、硫氢基混合物、咪唑烷基尿素、溴硝丙二醇。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。